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annotate makeitso/makeitso.py @ 26:044ac9e0b29c

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add a non-working example with an include clause
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 13 Dec 2010 21:03:39 -0800
parents fbf19940fa97
children ac44c36da885
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1 #!/usr/bin/env python
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2 """
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3 filesystem template interpreter
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4 """
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5
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6 import os
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7 import re
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8 import shutil
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9 import subprocess
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10 import sys
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11 import tempfile
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12 import urllib
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13 # TODO: may have to use urllib2.urlopen to get reasonable timeouts
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14
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15 from optparse import OptionParser
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16
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17 # URL of this file
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18 location = 'http://k0s.org/mozilla/hg/MakeItSo/raw-file/tip/makeitso/makeitso.py'
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19
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20 # URL of tempita
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21 tempita_location = 'http://bitbucket.org/ianb/tempita/raw-file/tip/tempita/'
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22
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23 def cleanup():
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24 # remove temporary net module directory
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25 if 'tempdir' in globals():
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26 shutil.remove(tempdir)
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28 try:
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29 import tempita
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30 except ImportError:
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31
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32 # Get tempita from the net
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33 # TODO: abstract this to get arbitrary modules from the net
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34 def getFiles(url, subdir, files):
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35 """
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36 fetch files from the internet
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37 - url : base url
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38 - subdirectory: to put things in
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39 - files : list of files to retrieve
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40 returns the location of a temporary directory
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41 """
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42 globals()['tempdir'] = tempfile.mkdtemp()
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43 os.mkdir(subdir)
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44 url = url.rstrip('/')
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45 for filename in files:
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46 f, headers = urllib.urlretrive('%s/%s' % (url, filename))
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47 content = file(f).read()
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48 outfile = os.path.join(globals()['tempdir'], subdir, filename)
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49 o = file(outfile, 'w')
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50 print >> o, content
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51 return globals()['tempdir']
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52
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53 tempita_files = ['__init__.py', '_looper.py', 'compat3.py']
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54
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55 try:
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56 t = getFiles(tempita_location, 'tempita', tempita_files)
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57 sys.path.append(t)
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58 import tempita
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59 except:
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60 cleanup()
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61 raise NotImplementedError('This should say something like youre not connected to the net')
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62
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63
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64
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65 # regular expressions for finding the shebang
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66 shebang_re = '#!.*makeitso.*'
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67 shebang_re = re.compile(shebang_re)
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68
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69 class MissingVariablesException(Exception):
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70 def __init__(self, message, missing):
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71 self.missing = missing
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72
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73 def call(command, *args, **kw):
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74 code = subprocess.call(command, *args, **kw)
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75 if code:
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76 if isinstance(command, basestring):
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77 cmdstr = command
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78 else:
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79 cmdstr = ' '.join(command)
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80 raise SystemExit("Command `%s` exited with code %d" % (cmdstr, code))
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81
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82 def base_uri(uri):
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83 if '://' in uri:
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84 return 'uri'.rsplit('/', 1)[0]
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85 return os.path.dirname(os.path.abspath('me'))
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86
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87 def include(uri):
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88 f, headers = urllib.urlretrieve(uri)
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89 return file(f).read()
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90
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91 ### functions for variables
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92
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93 defaults = {'include': include}
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94
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95 def get_missing(name_error):
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96 """
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97 This is a horrible hack because python doesn't do the proper thing
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98 via eval and return the name of the variable; instead, it just gives
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99 you a message:
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100 >>> try:
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101 ... eval('2*foo')
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102 ... except Exception, e:
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103 ... pass
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104 """
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105 message = name_error.args[0]
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106 varname = message.split("'")[1]
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107 return varname
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108
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109 def missing_variables(template, variables):
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110 """return additional variables needed"""
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111 vars = variables.copy()
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112 missing = set([])
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113 while True:
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114 try:
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115 template.substitute(**vars)
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116 return missing
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117 except NameError, e:
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118 missed = get_missing(e)
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119 missing.add(missed)
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120 vars[missed] = ''
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121 return missing
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122
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123 def template_variables(template):
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124 """return the variables needed for a template"""
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125 return missing_variables(template, {})
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126
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127 def read_variables(variables):
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128 retval = {}
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129 for i in variables:
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130 print 'Enter %s: ' % i,
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131 retval[i] = raw_input()
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132 return retval
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133
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134 def substitute(content, variables=None):
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135 """interactive (for now) substitution"""
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136
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137 # remove makeitso shebang if it has one
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138 if shebang_re.match(content):
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139 content = os.linesep.join(content.splitlines()[1:])
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140
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141 variables = variables or defaults.copy()
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142 template = tempita.Template(content)
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143 missing = missing_variables(template, variables)
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144 if missing:
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145 # TODO: add a switch for interactive or not
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146 variables.update(read_variables(missing))
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147 return template.substitute(**variables)
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148
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149 def invocation(url, **variables):
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150 """returns a string appropriate for TTW invocation"""
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151 variables_string = ' '.join(['%s=%s' % (i,j) for i,j in variables.items()])
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152 return 'python <(curl %s) %s %s' % (location, url, variables_string)
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153
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154 def main(args=sys.argv[1:]):
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155
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156 # create option parser
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157 usage = '%prog [options] template <template> <...>'
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158 parser = OptionParser(usage, description=__doc__)
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159 parser.add_option('-[', '--start-braces', dest='start_braces',
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160 help='starting delimeter')
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161 parser.add_option('-]', '--end-braces', dest='end_braces',
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162 help='starting delimeter')
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163 parser.add_option('--in-place', dest='in_place',
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164 action='store_true', default=False,
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165 help='interpret files in place') # TODO: unused
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166 parser.add_option('--commandline', dest='commandline',
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167 action='store_true', default=False,
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168 help="print the commandline to invoke this script TTW")
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169 parser.add_option('--variables', dest='variables',
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170 action='store_true', default=False,
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171 help='print the variables in a template')
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172 options, args = parser.parse_args(args)
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173
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174 # print the variables for the templates
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175 if options.variables:
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176
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177 # makes no sense without a template
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178 if not args:
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179 parser.print_usage()
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180 parser.exit()
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181
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182 # find all variables
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183 variables = set()
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184 for arg in args:
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185 content = file(arg).read()
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186 template = tempita.Template(content)
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187 variables.update(template_variables(template))
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188
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189 # print them
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190 for variable in variables:
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191 print variable
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192 return
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193
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194 # template variables
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195 variables = defaults.copy()
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196 _vars = []
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197 _args = []
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198 for arg in args:
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199 if '=' in arg:
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200 key, value = arg.split('=')
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201 variables[key] = value
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202 else:
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203 _args.append(arg)
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204 args = _args
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205
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206 # print TTW commandline for invocation
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207 if options.commandline:
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208 if args:
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209 for arg in args:
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210 print invocation(arg, **variables)
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211 else:
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212 print invocation('[URI]', **variables)
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213 return
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214
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215 # get the content
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216 if args:
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217 for arg in args:
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218 var_copy = variables.copy()
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219 var_copy['here'] = base_uri(arg)
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220 content = include(arg)
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221 print substitute(content, variables=var_copy)
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222 else:
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223 content = sys.stdin.read()
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224 print substitute(content, variables=variables)
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225
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226 # cleanup
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227 cleanup()
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228
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229 if __name__ == '__main__':
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230 main()